Collimated 36 x 1Watt LED panel for 150/- at DVinfo.net

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Old November 27th, 2009, 07:25 AM   #1
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Collimated 36 x 1Watt LED panel for 150/-

www.LEDwholesalers.com - Brightest Day Light White LED Photography Video Panel
Hmm! Am thinking of buying 4.
Their intl shipping is 10 bucks or less..

Any reviews by previous users ?
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Old November 27th, 2009, 10:59 AM   #2
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Never seen this but it looks interesting. You would definitely need to come up with some sort of housing to put this in but the price is cheap enough to possibly make it worth trying. I am curious what size these LEDs are. If they are 5mm with housings around each, the output will be really low. If they are larger sized LEDs, (hard to tell from the pictures), they could have a enough output to make this thing worthwhile.

If you try it, report back to us and let us know how they work for video, color temp, etc. Beware that LEDs all seem to have really low CRI so there will probably be a nice nasty green spike that needs to be mitigated with some 1/2 minus green gel.

Dan
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Old November 27th, 2009, 11:51 AM   #3
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i dont think they make a 1w led in 5.5mm. Unless they are just crazy inefficient, if they suck a watt each i'd think that should mean they are really bright.

but yeah, i'd be really curious about the cri. if its at all decent, it would be cool to try building a big wall-0-lite out of them. hehe.

cheers,
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Old November 29th, 2009, 07:46 AM   #4
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They are Edison Edixeon 1 Watt LED's with a typical Lumen output of 80 Lumen per LED and a beam angle of about 130. They tend to green at the corners, so you have to filter them through a 1/4 minus green or so.
I have one of those fixtures to experiment and they even have about 5500K as advertised.
Of course it's some kind of a barebone solution, which means you have to make your own fixture for it. But i'ts a pretty nice light.
I'd call it a good starting point.

Peter
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Old November 29th, 2009, 08:18 AM   #5
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I ordered on yesterday. Any thoughts on what I should use as a box?
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Old December 3rd, 2009, 06:24 PM   #6
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Well, my light arrived and it is bright. Very impressed. Too bad it takes 24V or I could make it portable. Now, I need ideas on how to house it.
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Old December 3rd, 2009, 10:52 PM   #7
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A mate of mine has used Aluminum U-channel for the top and bottom, and then you can drill and tap a 1/4-inch hole to attach on a regular tripod.
With the u-channel you can also attach it with clamps to a light stand.
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Old December 4th, 2009, 05:05 PM   #8
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What a fool I am. I'm a picture framer by trade and I didn't even think of that.
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Old December 4th, 2009, 06:06 PM   #9
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do let us know with pics how it turned out ?
I might build my own with ssc-p7 12w lights instead.
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Old December 4th, 2009, 08:06 PM   #10
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What creates the voltage requirement, the LED itself, or the quantity. I'm electrically challenged. :)
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Old January 1st, 2010, 02:22 AM   #11
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The total voltage requirement (also known as forward voltage) is a factor of the individual voltage of the each LED - in this case the individual voltage may be around 3- 3.9 volts.
Looking at the panel, it would seem that there are 6 LED's in series, i.e. the negative from the first LED is conected to the positive of the next LED and so on.
(For an explination of Series circuits see Series and parallel circuits - Wikipedia, the free encyclopedia )

So effectively you ADD the voltage needed by each LED in the string to come to the total forward voltage for example - 3.7 + 3.5 + 3.6 + 3.5 + 3.1 + 3.4 = 20.8 V

Note that typically, the forward voltage for each LED is different, meaning that each string of LED's will have a different forward voltage.

Also note that the voltage of the string does not quite add up to 24 volts, this is because of several factors including -
The LED driver consumes some power - this can be several volts itself, depending upon operating conditions and efficiency.
Operational Headroom- so that if your supply fluctuates by a small amount, your light will not change intensity.

So, to sum it up, the operational forward voltage of an LED array is the child of several factors- the individual LED forward voltage, The number of LED's and their total voltage added together, and the efficiency of the drive circuitry and headroom required ..

Hope this helps !!!!

Cheers,

T
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Old January 1st, 2010, 11:32 PM   #12
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That many LEDs for $155. This thing must be painfully green without some correction. Let us know how the colour is.
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Old January 8th, 2010, 09:16 PM   #13
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Tama, thank you for that terrific explanation. I guess I'm trying to find a way to power this thing with batteries.

Sorry eveyone, I've been negligent in not testing this light. I'll try to get some test footage this weekend.
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Old January 17th, 2010, 11:13 PM   #14
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similiar?

There are LED 1000 and 500 of Ebay with case and doors and spud mounts for about $400 are these just the same panels with a case?
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Old January 21st, 2010, 08:49 PM   #15
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I saw one of these panels in action at a trade show last week. The guy tapeing with it seemed oblivious to the wayyyyyyy green colour it put out. I shot about 30 seconds of the scene he was lighting with it and checked it in my AVID when I got home and yup WAYYYY green. This thing needs some serious minus green.
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